[Asterisk-Users] PSTN Incoming call on real line disrupts VoIP
call over DSL circuit
Hadar Pedhazur
hadar at unorthodox.com
Mon May 8 14:36:28 MST 2006
Alex Robar wrote:
> I'll lean this way too. I had a DSL line from Bell Canada in Kingston,
> Ontario, and an incoming call on that line to the POTS phones would
> cause VoIP traffic to become completely unintelligble. The VoIP call
> would have to be re-established to fix things. A quick call to Bell had
> a technican out to check the lines, and put a fix in place for me.
I was afraid of doing that, unless I specifically explain that it's a
VoIP thing, because otherwise, if the tech asks "what was interrupted",
I won't be able to show anything else...
Thanks for the suggestion!
> Alex Robar
>
> On 5/8/06, *Jerry Jones* <jjones at danrj.com <mailto:jjones at danrj.com>> wrote:
>
> I would guess either the DSL itself is bad or perhaps the dsl Modem.
> perhaps calling Bellsouth would be helpful? Does other Internet
> traffic get interrupted also?
>
>
> On May 8, 2006, at 1:42 PM, Hadar Pedhazur wrote:
>
> > I haven't seen anything this strange, and it's 100% reproducible.
> > I'm hoping that there are some clever ideas out there for what to
> > look for, since I can test to my heart's desire on this one...
> >
> > My Dad lives in Florida, and has a Bellsouth DSL line. Of course,
> > he has a regular POTS line connected on the same line. He has the
> > appropriate filters on every jack that has a phone connected to it,
> > and he even replaced one or two of them (when I thought that was
> > the problem).
> >
> > I sent him a HandyTone GS-486 (HT), configured to connect back to
> > my Asterisk server. He only has a single computer in his apartment,
> > so it's connected into the HT, and the HT is connected into the DSL
> > modem.
> >
> > He can make and receive calls on the HT, and the quality is
> > excellent. If he's speaking via the HT (meaning a VoIP-only call)
> > and the "real" phone rings, everything continues fine
> > (temporarily). If the real phone is answered, either by a person,
> > or by the answering machine (which is in another room, connected to
> > a filter on another jack), then the audio on the Asterisk
> > conversation becomes _one way_. My father can be heard _perfectly_
> > by the remote side of the conversation, but he can hear nothing.
> > When the POTS line is hung up, then both sides of the VoIP call go
> > dead (audio-wise). Of course, he can now redial a VoIP call, and
> > both sides work perfectly...
> >
> > At first, I couldn't imagine that it was anything other than a bad
> > filter, but other than replacing the filter (which didn't help),
> > nothing else stops working. He can continue to use the Internet
> > connection on his PC just fine, and I can continue to hear him
> > speak over the VoIP connection with no problems either, so the
> > Internet connection has not been lost.
> >
> > I have to admit to being completely clueless as to what to even
> > look for, so _any_ advice as to things to test for would be
> > appreciated. As I said at the top, I can reproduce this 100% of the
> > time, so I can easily setup any debugging environment in advance,
> > and trigger the problem at will, etc.
> >
> > Thanks in advance!
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